The purpose of this is to make it easier to maintain and eventually to
allow the rclone backends to be re-used in other projects without
having to use the rclone configuration system.
The new code layout is documented in CONTRIBUTING.
See #317 for details.
Use `rclone config` to add/change/remove password.
Tests that loads the default configuration will now fail with a better error message, and add a switch that makes it possible to disable password prompts and fail instead.
Make it possible to use the "RCLONE_CONFIG_PASS" environment variable as password for configuration.